Auxiliary propeller



. 1,546.789i C- NQVAK AUXILIARY PROPELLER Filed April 5. 1925 July 21, 1925.

IN v ENTOR maria .Wovak BY is:

a id I ATTORNEY 'To' all whom it may concern:

= Patented July '21, 1925.

1,546,789 PATENT OFFICE.

GHABLESNOVAK, OF DAVIDSONVILLE, MARYLAND.

AUXILIARY PROPELLER.

Application filed April 3, 1925. Serial No. 20,863.

. Be it known that 1, CHARLES Novena, a citizen of United States, residingat Davidsonville, in the county of Anne Arundel and State of Maryland, have invented cer-, tain new and useful Improvements in Auxiliary Propellers, of which the following 1s a specification.

This invention relates to improvements in driving means for motor propelled flying machines and has as one of its objects to provide a pair of propellers arranged in the manner of side wheelers to augment the propulsion of the vehicle to which they are attached.

It is a further feature to utilize the spent, exhaust gases of the motor to drive the auxiliary propellers, conserving their force and at the same time acting to muflie and minimize the exhaust in an effective manner.

Another purpose is in the provision of a combinedmuffling and auxiliary driving de vice, inexpensive to construct, easy to install and effective in operation.

- These several important aims andobjects,

are attained by the novel construction, combination and arrangement of parts, hereinafter described and shown in the accompanying drawing, forming an essential portion of this disclosure, andin which Figure 1 is a partial front elevational, partial sectional view of an embodiment of the invention as fully assembled ready for operation. I

Figure 2 is an end view of the same. Figure 3 is a transverse sectional View taken on line 33 of Figure 1.

The embodiment of the invention as shown is composed of base brackets 10 to be secured on fuselage or frame of the vehicle, preferably near the rear.

A palr of heads 11 form the ends of a cylindrical casing 12 fixed on the base, and

ijournalled axially of the casing, in packed bearings 13, is a shaft 14 extending equally out at each end.

Mounted midway on the shaft, within the casing is a drum 15 having a plurality of longitudinally extending vanes 16 arranged in uniform spaced relation on its periphery, the outer edges of the blades clearing the interior of the casing as the drum revolves.-

At the rear of the casing, centrally there- 'of, is attached a flattenedrelatively wide mouthed inlet nozzle 17 its outer tangen- .haust gases intosai It will now be seen that the motor exhaust will enter the casing, impinge upon the vanes and cause the drum and shaft to rotate, the gases being eventually discharged after having performed their work, and it will also be understood that the casing and vanes act efficiently in muflling the sound normally produced by the exhaust.

Secured on the extending ends of the shaft 14 are hubs 19 to which are rigidly attached a plurality of resilient blades 20, curved throughout their length in the direction of rotation as shown, these blades acting in the manner of paddle wheels assisting in the propulsion of the vehicle, being auxiliary and supplementary to the main driving propelle Thus the device is driven by otherwise lost energy and without creating back pressure if properly-designed, besides acting as a mufiier for the exhaust, the power of which is absorbed and utilized to the fullest extent possible.

Although the foregoing is generally descriptive of the invention, minor changes in form, proportion and even details of construction may be made without deviating from the general scope of the appended claim.

Having thus described my invention and set forth the manner of its construction and operation, what I claim as new and desire to of spaced vanes, meagre for conducting exa casing to impin'ge upon the drum vanes to cause'the to rotate, a ventforthegspent gases, fixed on the extending; enddfiipf the shaft, and a plurality of curved-spring blades fixed to the hubs in relation.

In witness whereof I' have aflixed mysignature. l

. CHARLES NOVAK. 

